﻿using System;
using System.Collections.Generic;
using System.Text;

namespace WFBASE
{
    public class WFJson
    {
        /// <summary>   
        /// 转换对象为JSON格式数据    
        /// </summary>    
        /// <typeparam name="T">类</typeparam>   
        /// /// <param name="obj">对象</param>  
        /// /// <returns>字符格式的JSON数据</returns>  
        public static string GetJSON<T>(object obj)
        {
            string result = String.Empty;
            try
            {
                System.Runtime.Serialization.Json.DataContractJsonSerializer serializer =
                    new System.Runtime.Serialization.Json.DataContractJsonSerializer(typeof(T));
                using (System.IO.MemoryStream ms = new System.IO.MemoryStream())
                {
                    serializer.WriteObject(ms, obj); result = System.Text.Encoding.UTF8.GetString(ms.ToArray());
                }
            }
            catch (Exception ex) { throw ex; } return result;
        }
        /// <summary>   
        /// /// 转换List<T>的数据为JSON格式    /// </summary>  
        /// /// <typeparam name="T">类</typeparam>   
        /// /// <param name="vals">列表值</param>   
        /// /// <returns>JSON格式数据</returns> 
        public static string JSON<T>(List<T> vals)
        {
            System.Text.StringBuilder st = new System.Text.StringBuilder();
            try
            {
                System.Runtime.Serialization.Json.DataContractJsonSerializer s
                    = new System.Runtime.Serialization.Json.DataContractJsonSerializer(typeof(T));

                int i = 1;
                foreach (T city in vals)
                {
                    if (i == 1) st.Append("[");
                    using (System.IO.MemoryStream ms = new System.IO.MemoryStream())
                    {
                        s.WriteObject(ms, city);
                        st.Append(System.Text.Encoding.UTF8.GetString(ms.ToArray()));

                    }
                    if (i  < vals.Count)
                    {
                        st.Append(",");
                    }
                    else


                        if (i == vals.Count)
                        {
                            st.Append("]");
                        }
                    i++;
                }
                //st.Remove(st.Length - 1, 1);

            }
            catch (Exception ex) { throw ex; } return st.ToString();
        }
        /// <summary>    
        /// JSON格式字符转换为T类型的对象    /// </summary>   
        /// /// <typeparam name="T"></typeparam>   
        /// /// <param name="jsonStr"></param>   
        /// /// <returns></returns>    
        public static T ParseFormByJson<T>(string jsonStr)
        {
            T obj = Activator.CreateInstance<T>();
            using (System.IO.MemoryStream ms =
                new System.IO.MemoryStream(System.Text.Encoding.UTF8.GetBytes(jsonStr)))
            {
                System.Runtime.Serialization.Json.DataContractJsonSerializer serializer =
                    new System.Runtime.Serialization.Json.DataContractJsonSerializer(typeof(T));
                return (T)serializer.ReadObject(ms);
            }
        }
    }
}
